chrome/browser/net/chrome_http_user_agent_settings.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
   6 #define CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/prefs/pref_member.h"
  13 #include "net/url_request/http_user_agent_settings.h"
  14
  15 class PrefService;
  16
  17 // An implementation of |HttpUserAgentSettings| that provides HTTP header
  18 // Accept-Language value that tracks Pref settings and uses
  19 // |content::GetUserAgent| to provide the HTTP User-Agent header value.
  20 class ChromeHttpUserAgentSettings : public net::HttpUserAgentSettings {
  21  public:
  22   // Must be called on the UI thread.
  23   explicit ChromeHttpUserAgentSettings(PrefService* prefs);
  24   // Must be called on the IO thread.
  25   virtual ~ChromeHttpUserAgentSettings();
  26
  27   void CleanupOnUIThread();
  28
  29   // net::HttpUserAgentSettings implementation
  30   virtual std::string GetAcceptLanguage() const OVERRIDE;
  31   virtual std::string GetUserAgent(const GURL& url) const OVERRIDE;
  32
  33  private:
  34   StringPrefMember pref_accept_language_;
  35
  36   // Avoid re-processing by caching the last value from the preferences and the
  37   // last result of processing via net::HttpUtil::GenerateAccept*Header().
  38   mutable std::string last_pref_accept_language_;
  39   mutable std::string last_http_accept_language_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(ChromeHttpUserAgentSettings);
  42 };
  43
  44 #endif  // CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
  45